package com.siebre.course01.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.MissingServletRequestParameterException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.ResponseStatus;

@ControllerAdvice
@ResponseBody
public class GlobalExceptionHandler {
    private static final Logger logger = LoggerFactory.getLogger(GlobalExceptionHandler.class);

    @ExceptionHandler(MissingServletRequestParameterException.class)
    @ResponseStatus(value = HttpStatus.BAD_REQUEST)
    public JsonResult handleHttpMessageNotReadableException(MissingServletRequestParameterException ex) {
        logger.error("缺少请求参数,{}",  ex.getMessage());
        return new JsonResult("400","缺少必要的参数");
    }

    @ExceptionHandler(NullPointerException.class)
    @ResponseStatus(value = HttpStatus.INTERNAL_SERVER_ERROR)
    public JsonResult handleTypeMismatchException(NullPointerException ex) {
        logger.error("空指针异常,{}",  ex.getMessage());
        return new JsonResult("500","空指针异常了");
    }

    /**
     * 系统异常 预期以外异常
     * 此种不利于排查异常，建议放在最下面
     * @param ex
     * @return
     */
    @ExceptionHandler(Exception.class)
    @ResponseStatus(value = HttpStatus.INTERNAL_SERVER_ERROR)
    public JsonResult handleUnexceptedServer(Exception ex) {
        logger.error("系统异常,{}",  ex.getMessage());
        return new JsonResult("500","系统发生异常，请联系管理员");
    }
}
